*{
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
}
.wrap{
    width: 2000px;
    height: 2000px;
}
header{
    display: flex;
    background: linear-gradient(to bottom, #f4f5f9 60%, #e2e2e2);
    .logo{
        height: 70px;
        margin: 0 50px 0 60px;
    }
}
img{
    display: block;
    height: 100%;
}
nav{
    ul{
    display: flex;
    height: 70px;
    li {
        border: 0px solid #000;
        border-right-width: 1px;
        border-image: linear-gradient(#fff,rgba(0,0,0,0.2)) 1;
        position: relative;
        a {
        height: 70px;
        line-height: 70px;
        display: block;
        width: 150px;
        text-align: center;
        color: #000;
            }
        }
    }
} 
nav {
    >ul{
        >li:last-child{
            border: none;
        }
    }
} 
nav {
    ul{
        li:hover{
            .drowmenu{
                display: block;
            }
        }
    }
} 
.drowmenu{
    position: absolute;
    display: none;
    ul{
        display: flex;
        flex-direction: column;
        li{
        border: none;
        background: linear-gradient(to bottom, #f4f5f9 60%, #e2e2e2);
    }
}
    
}
ul{
    li:hover{
        background: rgb(219, 219, 219);
    }
}

    .mainTop{
        width: 100%;
        height: 800px;
        background-image: url(../image/首页_01.png);
        background-repeat: no-repeat;
        background-size: cover;
        display: flex;
    }
    .mainBottom{
        width: 1500px;
        height: 420px;
        display: flex;
        .box{
            width: 300px;
            height: 266px;
            border: 1px solid #000;
        }
    }
